commit: teach --amend to carry forward extra headers

diff --git a/fast-import.c b/fast-import.c
index 742e7da6b8b58dd0803d89c6ad6c59589274a31b..8d8ea3c45c0be5481c7b452c27ee0d163d69fb00 100644 (file)
--- a/fast-import.c
+++ b/fast-import.c
@@ -722,13 +722,8 @@ static struct branch *new_branch(const char *name)
 
        if (b)
                die("Invalid attempt to create duplicate branch: %s", name);
-       switch (check_ref_format(name)) {
-       case 0: break; /* its valid */
-       case CHECK_REF_FORMAT_ONELEVEL:
-               break; /* valid, but too few '/', allow anyway */
-       default:
+       if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL))
                die("Branch name doesn't conform to GIT standards: %s", name);
-       }
 
        b = pool_calloc(1, sizeof(struct branch));
        b->name = pool_strdup(name);
@@ -2416,6 +2411,8 @@ static void note_change_n(struct branch *b, unsigned char old_fanout)
        /* <committish> */
        s = lookup_branch(p);
        if (s) {
+               if (is_null_sha1(s->sha1))
+                       die("Can't add a note on empty branch.");
                hashcpy(commit_sha1, s->sha1);
        } else if (*p == ':') {
                uintmax_t commit_mark = strtoumax(p + 1, NULL, 10);
@@ -2717,6 +2714,8 @@ static void parse_new_tag(void)
        from = strchr(command_buf.buf, ' ') + 1;
        s = lookup_branch(from);
        if (s) {
+               if (is_null_sha1(s->sha1))
+                       die("Can't tag an empty branch.");
                hashcpy(sha1, s->sha1);
                type = OBJ_COMMIT;
        } else if (*from == ':') {